One-dimensional lead iodide hybrid stabilized by inorganic hexarhenium cluster cations as a new broad-band emitter.

A novel one-dimensional (1D) hybrid {[Re 6 S 8 (PzH) 6 ][Pb 3 I 8 (DMF) 2 ]}·6(DMF) with hexarhenium cluster cations has been synthesized and characterized by means of single-crystal X-ray diffraction. Two DMF oxygen atoms bridge three lead iodides to form a set of lead iodides, {[PbI 4/2 I(O DMF ) 1/2 ][PbI 4/2 (O DMF ) 2/2 ][PbI 4/2 I(O DMF ) 1/2 ]} 2- , and these sets of lead iodide share edges to form a 1D lead iodide chain, [Pb 3 I 8 (DMF) 2 ] 2- which has never been reported before and is different from the typical edge sharing of octahedral PbI 6 units. 1D lead iodide chains are stacked along the a axis, and [Re 6 S 8 (PzH) 6 ] 2+ cations with H-bonded DMF molecules to pyrazole N-H reside between 1D lead iodide chains. This 1D lead iodide hybrid shows strong broad-band emission with a peak at 634 nm. The excellent photoluminescent properties of the new lead iodide hybrid exhibit great potential for optoelectronic applications in photonic devices with broad-band emission and stability. This study introduces a new class of lead iodide hybrid compounds having new inorganic cluster cations rather than the organic amine cations that have been used in numerous studies to date. This work opens a promising path to overcome the instability of perovskites including of organic amine cations.